Abstract:

The authors analyzed the growth and survival of the first generation of Litopenaeus vannamei after crossing within and between imported shrimp individuals (P♂, P♀) and selected individuals (H♂, H♀) using complete diallel crosses to set up four combinations, PP(P♀×P♂), PH(P♀×H♂), HP(H♀×P♂) and HH(H♀×H♂). The results showed that survival rate was in the order of HH>HP>PH>PP, and the survival heterosis appeared in PH, with average survival heterosis of (27.72?11.88)% in the young stage and 30.50 at the 90th day. In the early growth stage (the first 30 days), the average body length and weight were both sequenced as HP> PH> HH> PP, while in the late growth, as PP> HP> PH> HH. The growth heterosis was found in body length and weight. The values of body length heterosis were 24.00%, 13.71%, 2.55%, and 2.79%; while the values of body weight heterosis were 112.46%, 54.06%, 8.16%, and 12.48% at the 10th, 30th, 60th and 90th days. In conclusion, the growth and survival traits of hybrids offspring crossing selection individuals as male parents and imported individuals as female parents will be improved significantly.

Key words: Litopenaeus vannamei, diallel cross, heterosis, growth, survival rate